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Another part of it is that radio-frequency leakage from the lamp wiring was beginning to be a problem as far back as transistor machines. But the most fundamental fact is that there are very few signals slow enough to blink an LED these days! With slow CPUs, you could watch the bus ...
In the very old days, people built radios and such on wooden substrates that were actually bread-cutting boards. That’s where the name came from. It was common to draw a diagram with the physical layout you had in mind, glue it to the board, and use it as a guide for building and...
Retroreflectors are easy. And for a few meters of coverage, no fancy powerful transmitters are needed. Few months back I built a retroreflector “repeater” on a whim. It allowed the communication between 433Mhz amateur radios and 446MHz PMR radios. If the local osc in it ware to be FM...